Question : Give reasons why (Do any three out of four):(i) Herbivores have longer small intestine as compared tocarnivores.(ii)Mucus is secreted along with hydrochloricacid in the stomach.(iii)Rings of cartilage are present in trachea.(iv)Lungs always contain a residual volumeof air .

Question : Give reasons why (Do any three out of four):(i) Herbivores

1.	Question : Give reasons why (Do any three out of four):(i) Herbivores have longer small intestine as compared tocarnivores.(ii)Mucus is secreted along with hydrochloricacid in the stomach.(iii)Rings of cartilage are present in trachea.(iv)Lungs always contain a residual volumeof air .
Answer» Solution :(i) Herbivores have ionger SMALLINTESTINE so as to facilitatedigestion of cellulose. (ii)Mucus is secretedalongwith HCI so as to protect theinner liningof stomach from excoriation. (iii)Incomplete C-shaped RINGS of cartilagepresentin TRACHEA ensures that the air PASSAGE doesnot collapsewhenthere is no airin it. (iv)Lungs alwayscontain a residual volumeof air to provide sufficient `O_(2)`to be absorbed and`CO_(2)`to be RELEASED.